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lines off popular beaches in and around Perth to kill white, bull and tiger sharks over three metres (10 feet) long. The measures have been put in place in response to seven fatal shark attacks in Australia's south west in three years . Marine Biologist Dan Monbeaux explained why he was against the cull of the sharks, "they're in trouble and they need are help," he said. "They really need some more research, we need to understand their feeding and foraging behaviours and I think we also need to bring users of the marine environment, particularly those who are out at remote surf breaks, to understand theat they are sharing waters with large predators." Get the latest headlines http://www.telegraph.co.uk/ Subscribe to The Telegraph http://www.youtube.com/subscription_center?add_user=telegraphtv Like us on Facebook http://www.facebook.com/telegraph.co.uk Follow us on Twitter https://twitter.com/telegraph Follow us on Google+ https://plus.google.com/102891355072777008500/ Telegraph.co.uk and YouTube.com/TelegraphTV are websites of The Daily Telegraph, the UK's best-selling quality daily newspaper providing news and analysis on UK and world events, business, sport, lifestyle and culture.